1 Corinthians 7:10-12
10 Now, for those who are married I have a command, not just a suggestion. And it is not a command from me, for this is what the Lord himself has said: A wife must not leave her husband. 11 But if she is separated from him, let her remain single or else go back to him. And the husband must not divorce his wife.
12 Here I want to add some suggestions of my own. These are not direct commands from the Lord, but they seem right to me: If a Christian has a wife who is not a Christian, but she wants to stay with him anyway, he must not leave her or divorce her.Read full chapter